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Wondering what is this blue


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Curious if anyone has a clue where the blue comes from in this rock? Is it a mineral by itself? I'm not finding any info from MGS, no response from the Geological Society of MN

Found in north central Minnesota. 

I appreciate any ideas and people's time on this.

Thanks

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Its a piece of sandstone (rock type) that is naturally stained with most likely a magnesium or manganese mineral.  Sandstone is a very  common, sedimentary rock, in parts of MN.

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